PHP 5.4+ strict standards warnings. CB 1.x is not PHP 5.4+ ready so you'll see a couple of those from CB it self, but all are resolved with CB 2.0. That one in particular is coming from CB Juice, which we've no control over and is 3rd party maintained. I suggest posting any/all CB Juice issues to the below CB Juice forums.
www.joomlapolis.com/forum/226-cb-juice
Note strict standard warnings should cause no negative issues. They'll be suppressed on live site usages.